Finding the Third Proportional to 89.70 and 143.09

Step by Step Solution

1. Step 1: Write the proportion equation
   89.70 : 143.09 = 143.09 : x
2. Step 2: Convert to fraction form
   89.70/143.09 = 143.09/x
3. Step 3: Cross multiply
   89.70x = 143.09 × 143.09
4. Step 4: Simplify right side
   89.70x = 20,476.10
5. Step 5: Solve for x
   x = 20,476.10/89.70
6. Step 6: Final answer
   x = 228.27